<template>

  <div class="app-container">

    <h2 style="text-align: center;">发布新课程</h2>

    <el-steps :active="2" process-status="wait" align-center style="margin-bottom: 40px;">
      <el-step title="填写课程基本信息"/>
      <el-step title="创建课程大纲"/>
      <el-step title="最终发布"/>
    </el-steps>

    <el-button type="text" @click="openChapterDialog()">添加章节</el-button>
      <!-- 章节 -->
    <ul class="chanpterList">
        <li
            v-for="chapter in chapterVideoList"
            :key="chapter.id">
            <p>
                {{ chapter.title }}

                <span class="acts">
                    <el-button style="" type="text" @click="openVideo(chapter.id)">添加小节</el-button>
                    <el-button style="" type="text" @click="openEditChatper(chapter.id)">编辑</el-button>
                    <el-button type="text" @click="removeChapter(chapter.id)">删除</el-button>
                </span>
            </p>

            <!-- 小节 -->
            <ul class="chanpterList videoList">
                <li
                    v-for="video in chapter.children"
                    :key="video.id">
                    <p>{{ video.title }}

                <span class="acts">
                    
                    <el-button style="" type="text" @click="openEditVideo(video.id)">编辑</el-button>
                    <el-button type="text" @click="removeVideo(video.id)">删除</el-button>
                </span>
                    </p>
                </li>
            </ul>
        </li>
    </ul>

    <div>
        <el-button @click="previous">上一步</el-button>
        <el-button :disabled="saveBtnDisabled" type="primary" @click="next">下一步</el-button>
    </div>

    <!-- 添加和修改章节表单 -->
    <el-dialog :visible.sync="dialogChapterFormVisible" title="添加章节">
        <el-form :model="chapter" label-width="120px">
            <el-form-item label="章节标题">
                <el-input v-model="chapter.title"/>
            </el-form-item>
            <el-form-item label="章节排序">
                <el-input-number v-model="chapter.sort" :min="0" controls-position="right"/>
            </el-form-item>
        </el-form>
        <div slot="footer" class="dialog-footer">
            <el-button @click="dialogChapterFormVisible = false">取 消</el-button>
            <el-button type="primary" @click="saveOrUpdate">确 定</el-button>
        </div>
    </el-dialog>

    <!-- 添加和修改小节表单 -->
    <el-dialog :visible.sync="dialogVideoFormVisible" title="添加课时">
      <el-form :model="video" label-width="120px">
        <el-form-item label="课时标题">
          <el-input v-model="video.title"/>
        </el-form-item>
        <el-form-item label="课时排序">
          <el-input-number v-model="video.sort" :min="0" controls-position="right"/>
        </el-form-item>
        <el-form-item label="是否免费">
          <el-radio-group v-model="video.free">
            <el-radio :label="true">免费</el-radio>
            <el-radio :label="false">默认</el-radio>
          </el-radio-group>
        </el-form-item>
        <el-form-item label="上传视频">
          <!-- 
            on-success 文件上传成功调用的方法
            on-remove 删除文件调用的方法
            before-remove  删除文件之前调用的方法
            file-list 上传成功的文件的文件列表
            action 每次上传文件都会自动请求这个后端接口地址
           -->
          <el-upload
            :on-success="handleVodUploadSuccess"
            :on-remove="handleVodRemove"
            :before-remove="beforeVodRemove"
            :on-exceed="handleUploadExceed"
            :file-list="fileList"
            :action="BASE_API+'/eduvod/video/uploadAliyunVideo'"
            :limit="1"
            class="upload-demo">
        <el-button size="small" type="primary">上传视频</el-button>
        <el-tooltip placement="right-end">
            <div slot="content">最大支持1G，<br>
                支持3GP、ASF、AVI、DAT、DV、FLV、F4V、<br>
                GIF、M2T、M4V、MJ2、MJPEG、MKV、MOV、MP4、<br>
                MPE、MPG、MPEG、MTS、OGG、QT、RM、RMVB、<br>
                SWF、TS、VOB、WMV、WEBM 等视频格式上传</div>
            <i class="el-icon-question"/>
        </el-tooltip>
        </el-upload>
        </el-form-item>
      </el-form>
      <div slot="footer" class="dialog-footer">
        <el-button @click="dialogVideoFormVisible = false">取 消</el-button>
        <el-button type="primary" @click="saveOrUpdateVideo">确 定</el-button>
      </div>
    </el-dialog>

  </div>
</template>
<script>
import chapter from '@/api/edu/chapter'
import video from '@/api/edu/video'

export default {
    data() {
        return {
            saveBtnDisabled: false,
            chapterVideoList: [],
            courseId: '', // 课程id
            //===========================章节==============================
            chapter: { // 章节对象  对象字段需要与pojo类定义的属性一模一样
              title: '',
              sort: 0,
              courseId: '',
              id: ''
            },
            dialogChapterFormVisible: false, // 章节弹框
            //===========================小节==============================
            video: { // 小节对象
              title: '',
              sort: 0,
              free: '',
              courseId: '',
              chapterId: '',
              id: '',
              videoOriginalName: '',
              videoSourceId: '',
            },
            dialogVideoFormVisible:false, //小节弹框
            // ==========================视频上传==================
            fileList: [],//上传文件列表
            BASE_API: process.env.BASE_API // 接口API地址
        }
    },
    created() {
        // 获取路由的ID值
        if (this.$route.params && this.$route.params.id) {
            this.courseId = this.$route.params.id
            this.getAllChapterVideo()
        }
    },
    methods:{
        previous() {
            this.$router.push({path:'/course/info/' + this.courseId})
        },
        next() {
            //跳转到第三步
            this.$router.push({path:'/course/publish/' + this.courseId})
        },
        // 根据id查询章节以及小节
        getAllChapterVideo() {
          chapter.getAllChapterVideo(this.courseId)
            .then(response => {
              this.chapterVideoList = response.data.allChapterVideo
            })
        },
        // ========================================视频操作===============================
        //上传视频成功调用的方法
        handleVodUploadSuccess(response, file, fileList) {
            //上传视频id赋值
            this.video.videoSourceId = response.data.videoId
            //上传视频名称赋值
            this.video.videoOriginalName = file.name
        },
        handleUploadExceed() {
            this.$message.warning('想要重新上传视频，请先删除已上传的视频')
        },
        // 删除视频前
        beforeVodRemove(file, fileList) {
            return this.$confirm(`确定移除${file.name}?`)
        },
        // 删除视频
        handleVodRemove() {
            video.removeAliYunVideo(this.video.videoSourceId)
              .then(response => {
                  this.$message({
                    type: 'success',
                    message: '删除视频成功'
                  })
                  //把文件列表清空
                  this.fileList = []
                  //把video视频id和视频名称值清空
                  //上传视频id赋值
                  this.video.videoSourceId = ''
                  //上传视频名称赋值
                  this.video.videoOriginalName = ''
              })
        },
        // ========================================章节操作======================================================
        // 添加章节
        addChapter() {
          this.chapter.courseId = this.courseId
          chapter.addChapter(this.chapter)
            .then(response => {
              // 关闭弹窗
              this.dialogChapterFormVisible = false
              // 提示
              this.$message({
                type: 'success',
                message: '添加章节成功'
              })
              // 刷新页面
              this.getAllChapterVideo()
            })
        },
        // 添加/修改章节章节
        saveOrUpdate() {
          if (!this.chapter.id) {
            // 添加操作
            this.addChapter()
          } else {
            // 修改操作
            this.updateChapter()
          }
        },
        // 修改章节
        updateChapter() {
          chapter.updateChapter(this.chapter)
            .then(response => {
              // 关闭弹窗
              this.dialogChapterFormVisible = false
              // 提示
              this.$message({
                type: 'success',
                message: '修改章节成功'
              })
              // 刷新界面
              this.getAllChapterVideo()
            })

        },
        // 弹出添加修改章节弹框
        openChapterDialog() {
            this.chapter = {}
            this.dialogChapterFormVisible = true
        },
        // 修改章节弹框
        openEditChatper(chapterId) {
            this.dialogChapterFormVisible = true
            chapter.getChapterById(chapterId)
              .then(response => {
                  this.chapter = response.data.chapter
              })
        },
        // 删除章节
        removeChapter(id) {
          this.$confirm('此操作将删除章节, 是否继续?', '提示', {
                confirmButtonText: '确定',
                cancelButtonText: '取消',
                type: 'warning'
            }).then(() => {  //点击确定，执行then方法
                //调用删除的方法
                chapter.deleteChapter(id)
                  .then(response => {
                    // 提示
                    this.$message({
                      type: 'success',
                      message: '删除成功'
                    })
                    //刷新页面
                    this.getAllChapterVideo()
                })
            }) //点击取消，执行catch方法
        },
        // ========================================小节操作======================================================
        // 添加小节 弹窗
        openVideo(chapterId) {
            this.dialogVideoFormVisible = true,
            //清空
            this.video = {}
            this.fileList = []
            // 设置章节ID
            this.video.chapterId = chapterId
            // 设置课程ID
            this.video.courseId = this.courseId
        },
        // 添加修改小节
        saveOrUpdateVideo() {
          if (!this.video.id) {
            this.addVideo()
          } else {
            this.updateVideo();
          }
        },
        // 添加小节
        addVideo() {
          video.addVideo(this.video)
            .then(response => {
                // 关闭弹窗
                this.dialogVideoFormVisible = false,
                // 提示
                this.$message({
                  type: 'succsee',
                  message: '添加小节成功!'
                });
                this.fileList = []
                // 刷新页面
                this.getAllChapterVideo()
            })
        },
        // 修改小节
        updateVideo() {
          video.updateVideo(this.video)
            .then(response => {
                // 关闭弹窗
                this.dialogVideoFormVisible = false,
                // 提示
                this.$message({
                  type: 'succsee',
                  message: '添加小节成功!'
                });
                // 刷新页面
                this.getAllChapterVideo()
            })
        },
        // 修改小节  弹框
        openEditVideo(id) {
          video.getVideoById(id)
            .then(response => {
                this.dialogVideoFormVisible = true,
                this.video = response.data.video
            })
        },
        // 删除小节
        removeVideo(id) {
            this.$confirm('此操作将删除章节, 是否继续?', '提示', {
                            confirmButtonText: '确定',
                            cancelButtonText: '取消',
                            type: 'warning'
                }).then(() => {  //点击确定，执行then方法
                    //调用删除的方法
                    video.removeVideo(id)
                      .then(response => {
                        this.$message({
                          type: 'success',
                          message: '删除成功'
                        })
                        // 刷新页面
                        this.getAllChapterVideo()
                      })
                }) //点击取消，执行catch方法
        }

    }
}
</script>
<style scoped>
  .chanpterList{
      position: relative;
      list-style: none;
      margin: 0;
      padding: 0;
  }
  .chanpterList li{
    position: relative;
  }
  .chanpterList p{
    float: left;
    font-size: 20px;
    margin: 10px 0;
    padding: 10px;
    height: 70px;
    line-height: 50px;
    width: 100%;
    border: 1px solid #DDD;
  }
  .chanpterList .acts {
      float: right;
      font-size: 14px;
  }

  .videoList{
    padding-left: 50px;
  }
  .videoList p{
    float: left;
    font-size: 14px;
    margin: 10px 0;
    padding: 10px;
    height: 50px;
    line-height: 30px;
    width: 100%;
    border: 1px dotted #DDD;
  }

</style>